Your files stay on your Mac.
iTunes M4V is Apple's video container — structurally identical to MP4 but carrying the .m4v extension used by the iTunes Store. Convertessa reads your personal, unprotected M4V files and converts them to two dozen video and audio formats entirely on your Mac. Drop a single file or an entire folder and pick your output.
Drag an M4V file — or a whole folder of them — onto Convertessa. The app reads the file locally without uploading anything.
Choose a target from the output list: MP4, MKV, MOV, AVI, WebM, AAC, MP3, FLAC, and more. When converting to a lossy format, set quality to balance file size and fidelity.
Click Convert. The output file lands next to the original. Nothing leaves your Mac.
Images, audio, video, documents, archives and eBooks — all converted natively, right on your Mac.
Pick a format you have — see everything Convertessa can turn it into.
Convert hundreds of files at once with per-type group defaults and individual overrides.
First-class support for HEIC, AVIF and WebP — encode and decode, both ways. Read JPEG XL and a dozen more modern formats too.
Drop files anywhere on the window. Native, instant, and exactly what you’d expect on a Mac.
Dial in compression, resolution and bitrate. Keep originals pristine or shrink for sharing.
Never overwrite a file by accident. Convertessa appends safe suffixes automatically.
Every job is logged locally. Re-run a previous conversion or revisit recent outputs in a click.
Bundle your converted files straight into a single ZIP, TAR or 7z — packaged and ready to share the moment a job finishes.
Right-click any file in Finder and choose Convert. A Quick Action handles it on the spot — no need to open the app first.
Shrink Convertessa to a tidy mini window that tucks into a corner — just a drop zone and a format picker for quick, one-off conversions.
No cloud. No account. No upload. Every conversion happens entirely on-device, using the power already in your Mac. What you convert is nobody’s business but yours.
Script conversions, wire them into your build, or batch a folder from the terminal. The same engine, no GUI required.
Read the full CLI documentation →Shrink Convertessa down to a small, focused window — drop, convert, done, with your recent conversions one click away.
macOS 14+ · Apple Silicon & Intel
New formats, new features, and fixes — every release, on the record.
Yes. Drag a folder onto Convertessa and it converts every M4V file inside in a single pass — no need to queue files one by one.
When you choose a lossy target such as MP4, AAC, or MP3, a quality slider appears before you click Convert. Raise it to preserve fidelity; lower it to reduce file size.
No. Convertessa runs entirely offline on your Mac. Your files are never sent to a server or cloud service.